--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,6 +39,10 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(AwsCheckHeadersCxx)
 include(CTest)
 
+if (DEFINED ENV{CMAKE_PREFIX_PATH})
+    set(CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH})
+endif()
+
 if (DEFINED CMAKE_PREFIX_PATH)
     file(TO_CMAKE_PATH "${CMAKE_PREFIX_PATH}" CMAKE_PREFIX_PATH)
 endif()
